GB824968A - Improvements in or relating to a switching device - Google Patents

Abstract

824,968. Pulse gating circuits. SPERRY RAND CORPORATION. Dec. 4, 1956, No. 37042/56. Class 40 (9). Co-ordinate windings of a magnetic matrix store are each energized from a continuous supply of alternating positive and negative pulses, positive pulses being applied over a winding of one bi-stable core and negative pulses being applied over a winding of a second bi-stable core, the pre-set stable states of the bi-stable cores determining whether a pulse is applied to the co-ordinate winding or not. As shown in Fig. 5, cores 77 and 78 are associated with co-ordinate winding 75, and cores 79, 80 are associated with co-ordinate winding 76. Pulses, as illustrated, from sources PP-5 and PP-6 alternately energize windings on cores 78 and 80, and 77 and 79, respectively. If during a negative pulse from PP-6 either of the cores 77, 79 is set so that the subsequent positive pulse from PP-6 finds high impedance in the core winding, the associated co-ordinate winding remains unenergized. Any core which is not so set presents low impedance and allows passage of a positive pulse. During periods when PP-6 is negative source PP-5 is also negative and drives a selected co-ordinating winding negatively depending on the condition of cores 78, 80, as set during the preceding positive period of PP-5. In Fig. 6 a single pulse source PP-7 alternately energizes excitation windings on each one of the pairs of cores 84, 85 and 86, 87, associated with the co-ordinate windings 82, 83. Set windings are provided individual to each core but are not shown. If a core is set so as to be turned over by its excitation winding a pulse is induced in an output winding and energizes the co-ordinate winding, if not so set no pulse is induced. As shown in Fig. 2, co-ordinate windings may be driven from both ends. Windings 1 to 6 form a 3 X 2 matrix driven from wires 13, 14, 15 along one edge and from wires 16 to 19 along the other edge. Each wire 13, 14, 15 is connected to a pair of bi-stable cores arranged in the manner of Fig. 6 and can feed two coordinate windings the other ends of which are connected by lines 16 to 19 to similar pairs of bi-stable cores. To drive co-ordinate winding 1 with a positive pulse the cores 20 and 27 are set during a preceding negative half-cycle so that outputs are induced during a positive pulse. Set windings are not shown except on core 26. To drive winding 1 with a negative pulse cores 21 and 26 are set. Rectifiers associated with potential sources ΠE/2 limit the voltages applied to the co-ordinate windings. Such a matrix of co-ordinate windings may be driven along each edge by bi-stable cores arranged as in Fig. 5 (see Fig. 3, not shown) or one edge of the matrix may be driven over pairs arranged as in Fig. 5 while the other edge is driven over pairs arranged as in Fig. 6 (see Fig. 4, not shown).